-/* This file is part of
- * ======================================================
- *
- * LyX, The Document Processor
- * Copyright 2001 The LyX Team.
+/**
+ * \file lyxsum.C
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
*
- * ======================================================
+ * \author Lars Gullik Bjønnes
+ *
+ * Full author contact details are available in file CREDITS
*/
-
#include <config.h>
+#include "support/lyxlib.h"
+#include "debug.h"
+
#include <algorithm>
#include <boost/crc.hpp>
-#include "support/lyxlib.h"
-#include "debug.h"
+using std::endl;
+
+// OK, this is ugly, but it is the only workaround I found to compile
+// with gcc (any version) on a system which uses a non-GNU toolchain.
+// The problem is that gcc uses a weak symbol for a particular
+// instantiation and that the system linker usually does not
+// understand those weak symbols (seen on HP-UX, tru64, AIX and
+// others). Thus we force an explicit instanciation of this particular
+// template (JMarc)
+template class boost::detail::crc_table_t<32, 0x04C11DB7, true>;
// Various implementations of lyx::sum(), depending on what methods
// are available. Order is faster to slowest.
#include <unistd.h>
#include <sys/mman.h>
-using std::ifstream;
-using std::endl;
-using std::for_each;
-using std::istreambuf_iterator;
-using std::istream_iterator;
-using std::ios;
-
-unsigned long lyx::sum(string const & file)
+unsigned long lyx::support::sum(string const & file)
{
lyxerr[Debug::FILES] << "lyx::sum() using mmap (lightning fast)"
<< endl;
-
+
int fd = open(file.c_str(), O_RDONLY);
if (!fd)
return 0;
-
+
struct stat info;
fstat(fd, &info);
-
+
void * mm = mmap(0, info.st_size, PROT_READ,
MAP_PRIVATE, fd, 0);
// Some platforms have the wrong type for MAP_FAILED (compaq cxx).
close(fd);
return 0;
}
-
+
char * beg = static_cast<char*>(mm);
char * end = beg + info.st_size;
-
+
boost::crc_32_type crc;
crc.process_block(beg, end);
unsigned long result = crc.checksum();
-
+
munmap(mm, info.st_size);
close(fd);
-
+
return result;
}
#else // No mmap
#include <fstream>
#include <iterator>
+using std::for_each;
+
namespace {
template<typename InputIterator>
} // namespace
#if HAVE_DECL_ISTREAMBUF_ITERATOR
-unsigned long lyx::sum(string const & file)
+using std::ifstream;
+using std::istreambuf_iterator;
+
+unsigned long lyx::support::sum(string const & file)
{
lyxerr[Debug::FILES] << "lyx::sum() using istreambuf_iterator (fast)"
<< endl;
ifstream ifs(file.c_str());
if (!ifs) return 0;
-
+
istreambuf_iterator<char> beg(ifs);
istreambuf_iterator<char> end;
-
+
return do_crc(beg,end);
}
#else
-unsigned long lyx::sum(string const & file)
+
+using std::istream_iterator;
+using std::ios;
+
+unsigned long lyx::support::sum(string const & file)
{
lyxerr[Debug::FILES]
<< "lyx::sum() using istream_iterator (slow as a snail)"
<< endl;
-
+
ifstream ifs(file.c_str());
if (!ifs) return 0;
-
+
ifs.unsetf(ios::skipws);
istream_iterator<char> beg(ifs);
istream_iterator<char> end;
-
+
return do_crc(beg,end);
}
#endif